NDLI: Current measurements using optical power

Content Provider	IEEE Xplore Digital Library
Author	Werthen, J.G. Andersson, A.G. Weiss, S.T. Bjorklund, H.O.
Copyright Year	1996
Description	Author affiliation: Photonic Power Syst. Inc., Mountain View, CA, USA (Werthen, J.G.)
Abstract	Fiber optic systems are becoming increasingly important for measurements of current, voltage and temperature in high voltage environments. Conventional electrical wiring such as a current transformer can readily be replaced by noise-free fiber optics. With an optically powered data link and a transducer, direct current, voltage and temperature measurements have been successfully demonstrated. The system includes two modules connected by optical fiber up to 1 km in length. One module is placed at a control site. It supplies optical power for transmission to, and receives data from, the measurement module, which is placed at a remote site, in this case at high voltage. This remote module converts the optical power into electrical power for the electronic circuitry, the transducer and a data communications link. The analog voltage from the transducer is fed into an analog to digital converter. Test results verify successful operation with a sampling rate of 33.3 kHz. Taking anti-aliasing filters into account, an equivalent analog bandwidth of 10 kHz was achieved with an overall resolution of 0.025% (12 bits) and a 0.2% accuracy. Together with modern digital relays this technology offers new reliable ways to improve the protection of high voltage systems. Fully operational over the temperature range -40/spl deg/C to +85/spl deg/C, the system is sufficient for most electric power applications.
Starting Page	213
Ending Page	218
File Size	746850
Page Count	6
File Format	PDF
ISBN	0780335228
DOI	10.1109/TDC.1996.545937
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-09-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current measurement Optical filters Optical fibers Transducers Voltage measurement Temperature Wiring Current transformers Working environment noise Optical noise
Content Type	Text
Resource Type	Article

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